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Analog window watchdog

Question asked by JAN R on Oct 5, 2017
Latest reply on Oct 5, 2017 by John Craven

Hi Guys,

 

I have STM32L071 and I want to use analog window watchdog for detecting if voltage on channel 2 is bellow my threshold. I use it and it works really nice.

I use this settings for ADC:

/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.OversamplingMode = DISABLE;
hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.SamplingTime = ADC_SAMPLETIME_39CYCLES_5;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.DMAContinuousRequests = ENABLE;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerFrequencyMode = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

 

/**Configure the analog watchdog
*/
AnalogWDGConfig.WatchdogMode = ADC_ANALOGWATCHDOG_SINGLE_REG;
AnalogWDGConfig.Channel = ADC_CHANNEL_2;
AnalogWDGConfig.ITMode = ENABLE;
AnalogWDGConfig.HighThreshold = 4095;
AnalogWDGConfig.LowThreshold = 2808;
if (HAL_ADC_AnalogWDGConfig(&hadc, &AnalogWDGConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

 

And whenever the voltage is bellow the level threshold onchannel 2 so interrupt occurs.

 

But now I want to use also classical measuring on channel 1.

I want to the analog watchdog works still independenty on CPU performance. And in some time I want to read voltage on channel 1.  But it does not work with nalog watchdog. How to combine this 2 methods?

 

Stateflow_ADC_AWD

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